Noob resistor questions

Discussion in 'General Electronics Chat' started by razz, Mar 8, 2011.

  1. razz

    Thread Starter New Member

    Feb 28, 2011
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    Ok i'm very new at this, i figured i could start learning stuff on my spare time, so i bought 100$ wort of LEDs, capacitors, resistors, etc to play around.

    so i'm making a circuit, and i have abot 30 different type of resistors with me, i need one that is 330ohm, according to online source, its color is orange orange brown. However, all my resistors have 5 bands of colors, am i only suppose to read the 3 in the middle? I know one is for tolerance, but what about the 5th?
    also how do you know if you're reading from left to right or right to left?
    orange, black, red ....or red, black orange ? know what I mean

    Thanks for any input,
    i'll probably be asking more noob questions in the next few days.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    You should have bought a DMM first.

    Five band resistors is sometimes confusing.
    The temperature coefficient band is a bit futher away than the rest.

    For a Metal film resistors, five bands are used. all 4 bands counts for the numericals.

    The bands with equal distance is where you should look. The fifth bans is always a bit far

    Bythe way...Welcome to AAC.

    The more you ask the more you will learn, and the more friendlier you will become to AAC folks
     
  3. SgtWookie

    Expert

    Jul 17, 2007
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    PackratKing likes this.
  4. nDever

    Active Member

    Jan 13, 2011
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    Read from left to right with the tolerance band on the rightmost side of the resistor.
     
  5. razz

    Thread Starter New Member

    Feb 28, 2011
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    the 1st band & 5th band are each on the bigger end, and then there is the 3 bands in the middle, so how do i know which one is the 1st band on either side and which is the 5th?

    Thanks for that link ! I could use something like that to confirm I have the right resistor in hand!
     
  6. someonesdad

    Senior Member

    Jul 7, 2009
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    While being able to read color codes is handy, you need a simple DMM as someone else mentioned. Go get a $3 Harbor Freight one -- it's fine for your needs.
     
  7. Jaguarjoe

    Active Member

    Apr 7, 2010
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    Every time I get a shipment of stuff from MP Jones, he throws in a business card sized resistor value calculator card. Maybe if you ask for one, he'll send one to you. If that doesn't work, PM me with your address and I'll send you mine.
     
  8. razz

    Thread Starter New Member

    Feb 28, 2011
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    Lets look at this picture i took of one of my resistors,
    i need orange orange brown, clearly this isn't it, but closes one i could find based on colors...lol.
    Which of these 5 bands are the 3 i am looking for, is this one orange black black?
    or am i reading it upside down and is really black black orange? how am i suppose to know ?!
    thought it would help with a picture:


    [​IMG][​IMG]
     
  9. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Can you read the entire 5 bands for us
    And usually the last band in 5 bands resistor is Brown or Red
     
  10. razz

    Thread Starter New Member

    Feb 28, 2011
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    from left to right on that picture
    Orange Orange Black Black Brown

    but maybe i'm holding it upside down and it's really
    Brown Black Black Orange Orange

    that's what i'm trying to figure out...

    Here is my first little tests,
    http://www.youtube.com/watch?v=I1YLbOm9C4U
    just want to flash some lights, i put 2 different capacitors for different blinking pattern,
    I'm not even sure if those lights should be next to each other as they are
    also, not sure which resistors i'm using, lol.
    and I can still smell something that smells like burning, slighty.... this would be caused by resistors that are to low?
     
    Last edited: Mar 10, 2011
  11. Wendy

    Moderator

    Mar 24, 2008
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    The DVM suggestion is a good one. My eyes aren't as good as they used to be, and the colors may not be as accurate as they should be, the DVM will tell the tale. After you are through measuring you can compare what you measured to what is marked on the resistor.
     
  12. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    For sure it is Orange Orange Black Black Brown.
    Becaues in 5 bands resistor the last band is typically Brown or Red.
    And Orange can not be the last band.
     
  13. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    I post for a clear pic
     
  14. razz

    Thread Starter New Member

    Feb 28, 2011
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    ok, good to know!
    so now my next question, for the 3 bands that determine the OHM,
    is it orange orange black, or orange black black in the picture

    sorry for low quality, taking with my BB
     
  15. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    orange orange black = 330
    orange black black = 300
     
  16. razz

    Thread Starter New Member

    Feb 28, 2011
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    I know orange orange black = 330, etc

    but look at the resistor... WHICH 3 bands are the ones that tell the ohm?

    the middle 3? the first 3? the last 3?
     
  17. Wendy

    Moderator

    Mar 24, 2008
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    Depends on percentage. Most 5% resistors only have 3 bands, plus a tolerance band (gold or silver). With 1% resistors 4 numbers are needed. It is spelled out in the tables that were linked to in earlier posts.
     
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